Posted on 05/05/2019 8:54:57 AM PDT by DUMBGRUNT
For something so commonplace, glass is actually an incredible mystery; an enigma of physics that has defied understanding since humans first encountered it millennia ago.
The reason is this: glass is no ordinary solid. But nor is it a liquid. It lies somewhere in between, a strange hybrid known as an amorphous solid – something that's firm to the touch, yet down at the atomic level, it actually behaves rather more like liquid.
(Excerpt) Read more at sciencealert.com ...
The Corning Museum of Glass
https://www.cmog.org/article/does-glass-flow
More details on old window glass production.
Fun!!!
.308 REAL BULLET HANDMADE WHISKEY GLASS SINGLE
Glass is a solid. That is how it holds liquid water in an 8 oz glass. All materials decay over time.
Before the “float glass” process was invented, glass was rolled and was wavy. Old wavy glass is highly prized by building restorers for authenticity — I hope you keep the old glass or sold it!
Wiki - “Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and various low melting point alloys were used in the past. This method gives the sheet uniform thickness and very flat surfaces. Modern windows are made from float glass.”
Possession of that whisky glass here in California would probably land you in prison.
Years ago to test the theory some researcher went to hundreds of years old cathedrals in Europe to measure the thickness of glass at the top of stained glass windows - and at the bottom. Sure enough the glass at the bottom was thicker...
Hm I knew a glass manufacturer who owned a colonial home with original windows. He said the bottoms of the panes had settled and were thicker at the bottom. He absolutely believed that.
It’s probably known to the state of California to cause cancer.
Speaking of time, just how long should it take—theoretically—for windows to thicken to any observable extent? Many years ago, Dr. Chuck Kurkjian told me that an acquaintance of his had estimated how fast—actually, how slowly—glasses would flow. The calculation showed that if a plate of glass a meter tall and a centimeter thick was placed in an upright position at room temperature, the time required for the glass to flow down so as to thicken 10 angstrom units at the bottom (a change the size of only a few atoms) would theoretically be about the same as the age of the universe: close to ten billion years. Similar calculations, made more recently, lead to similar conclusions.
https://www.cmog.org/article/does-glass-flow
Mothers day is next Sunday. Now I know what I’m giving my wife.
I think he actually meant “cisparent” but scholars and SJWs are divided on the issue. The SJWs insist he meant cislucent. That’s according to my latest information. Anyway, what a uniter he was!
The composition of glass varies. They dont make it the same as they did 75 years ago.
Well, I suppose it all boils down to the gender the
glass believes it is at any particular moment.
Glass is a transparent stable form of Silly Putty.
Silly Putty!!!! Oobleck!!!
No doubt you were just waiting for the right time to toss that old non-Newtonian fluid into the mix!
Now might be the time to bring up thixotropy and some other non-Newtonian pseudoplastic fluids.
Ketchup? Yogurt? Quicksand!!!
Fun is where you find it.
“Silly Putty is a toy based on silicone polymers that have unusual physical properties. It bounces, but it breaks when given a sharp blow, and it can also flow like a liquid. It contains a viscoelastic liquid silicone, a type of non-Newtonian fluid, which makes it act as a viscous liquid over a long time period but as an elastic solid over a short time period”
I was just a kid in 1939 when my folks took us to the World’s Fair in New York. We went to a Corning Glass exhibit where a guy blew what looked like a goldfish bowl. He said if anybody could guess what it was, they would have it. Wrong answers for a few minutes, then he said “It’s a dish!”, grabbed the end and flattened it out. I thought it was magic.
In 2019, you can get in real trouble grabbing a dish by the end.
Heck, even solids sag. Every married man knows this.
Nothing fake about it. It also happens with glass tubing, which is why tubing in glassblower's shops is stored vertically rather than horizontally.
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